Congest and Jam-pack

Congest verb - To prevent passage through by filling with something.

Jam-pack and congest are semantically related In some cases you can use "Jam-pack" instead a verb "Congest".

Jam-pack verb - To put into (something) as much as can be held or contained.

Congest and jam-pack are semantically related in crowd topic. Sometimes you can use "Congest" instead a verb phrase "Jam-pack".